1、啟動elasticsearch報錯，如下所示：
1 [elsearch@master elasticsearch-7.2.1]$ ./bin/elasticsearch 2 OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release. 3 [2021-08-13T11:02:10,661][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [master] uncaught exception in thread [main] 4 org.elasticsearch.bootstrap.StartupException: java.lang.IllegalStateException: failed to obtain node locks, tried [[/data/elasticsearch-7.2.1/data]] with lock id [0]; maybe these locations are not writable or multiple nodes were started without increasing [node.max_local_storage_nodes] (was [1])? 5 at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:163) ~[elasticsearch-7.2.1.jar:7.2.1] 6 at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:150) ~[elasticsearch-7.2.1.jar:7.2.1] 7 at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[elasticsearch-7.2.1.jar:7.2.1] 8 at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) ~[elasticsearch-cli-7.2.1.jar:7.2.1] 9 at org.elasticsearch.cli.Command.main(Command.java:90) ~[elasticsearch-cli-7.2.1.jar:7.2.1] 10 at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:115) ~[elasticsearch-7.2.1.jar:7.2.1] 11 at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) ~[elasticsearch-7.2.1.jar:7.2.1] 12 Caused by: java.lang.IllegalStateException: failed to obtain node locks, tried [[/data/elasticsearch-7.2.1/data]] with lock id [0]; maybe these locations are not writable or multiple nodes were started without increasing [node.max_local_storage_nodes] (was [1])? 13 at org.elasticsearch.env.NodeEnvironment.<init>(NodeEnvironment.java:298) ~[elasticsearch-7.2.1.jar:7.2.1] 14 at org.elasticsearch.node.Node.<init>(Node.java:271) ~[elasticsearch-7.2.1.jar:7.2.1] 15 at org.elasticsearch.node.Node.<init>(Node.java:251) ~[elasticsearch-7.2.1.jar:7.2.1] 16 at org.elasticsearch.bootstrap.Bootstrap$5.<init>(Bootstrap.java:221) ~[elasticsearch-7.2.1.jar:7.2.1] 17 at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:221) ~[elasticsearch-7.2.1.jar:7.2.1] 18 at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:349) ~[elasticsearch-7.2.1.jar:7.2.1] 19 at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:159) ~[elasticsearch-7.2.1.jar:7.2.1] 20 ... 6 more
場景描述，在啟動elastichsearch之前使用了root賬號進行啟動，啟動失敗之后，直接使用elsearch自己創建得這個賬號啟動es，發現報錯，解決方法是將es安裝目錄下面得data目錄下面的nodes全部刪除，重新使用elsearch啟動es即可。